1. The Atom

2. Nucleus The center of the atom Has a positive charge
What gives it this positive charge?

3. Proton
Positively charged
Located in the nucleus

4. Neutron
No electrical charge
Neutral
Located in the nucleus

5. Electron
Negatively charged
Surround the nucleus
Electron clouds

6. Atomic Mass Unit
The SI unit used to express the masses of the particles in an atom
Proton = 1 amu
Neutron = 1 amu
Electron = negligible

7. Atomic Number Atomic Number The number of protons in an atom
Identifies the atom as a particular element
Atomic Number

9. Mass Number
The sum of the protons and neutrons in an atom

10. Isotopes
Atoms that have the same number of protons but different number of neutrons
Share most of the same properties

11. Atomic Mass Atomic Mass
Weighted average of the masses of all the isotopes of an element
Atomic Mass

12. Atomic Number Chemical Symbol Name of Element Atomic Mass
# of _________________ and # of
_________________
Chemical Symbol
Name of Element
# of _________________ +
_________________
Atomic Mass

13. Cu # of protons = ________ # of electrons = ________
# of neutrons = ________ Cu

14. Cool Video